Auricularia cornea

Auricularia cornea is a basidiomycete fungus that, in agricultural and forestry contexts, can act as a wood-decay pathogen. While recognized globally for its cultivation as an edible fungus, in a landscape or orchard setting, it occupies the ecological niche of a primary or secondary pathogen that compromises the integrity of woody plant tissue.

The fungus is classified as a wood-rotting agent causing white rot. It functions by enzymatic degradation of cellulose and lignin within the host plant. Infection typically initiates through entry points such as pruning wounds, broken branches, or bark lesions caused by environmental stress, eventually colonizing the heartwood and sapwood.

Broadleaf trees and fruit-bearing woody species are the primary hosts for this fungus. Weakened trees, whether due to age, environmental factors like excessive humidity, or competition, are significantly more susceptible to colonization. The presence of the fungus often indicates an underlying issue with the tree's health or physiological state.

Symptoms of an infestation are distinctly characterized by the emergence of gelatinous, ear-shaped, or horn-like fungal fruiting bodies on the bark. Internal signs involve the structural degradation of the wood, which becomes soft, bleached, and fibrous. This loss of structural integrity leads to increased risk of trunk fracture and falling branches.

Effective management and protection against this fungal pathogen center on maintaining tree vigor and physical integrity:

• Ensure proper pruning techniques to allow for rapid wound occlusion.
• Apply protective sealants to large wounds and branch stubs to prevent spore entry.
• Improve soil and water management to reduce tree stress.
• Regularly monitor trees for signs of wood decay and remove heavily infected limbs.